
var tableStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var table = tableStr.split("");

function atob(base64) {
  if (/(=[^=]+|={3,})$/.test(base64))
    throw new Error("String contains an invalid character");
  base64 = base64.replace(/=/g, "");
  var n = base64.length & 3;
  if (n === 1)
    throw new Error("String contains an invalid character");
  for (var i = 0, j = 0, len = base64.length / 4, bin = []; i < len; ++i) {
    var a = tableStr.indexOf(base64[j++] || "A"), b = tableStr.indexOf(base64[j++] || "A");
    var c = tableStr.indexOf(base64[j++] || "A"), d = tableStr.indexOf(base64[j++] || "A");
    if ((a | b | c | d) < 0)
      throw new Error("String contains an invalid character");
    bin[bin.length] = ((a << 2) | (b >> 4)) & 255;
    bin[bin.length] = ((b << 4) | (c >> 2)) & 255;
    bin[bin.length] = ((c << 6) | d) & 255;
  }

  return String.fromCharCode.apply(null, bin).substr(0, bin.length + n - 4);
}

function btoa(bin) {
  for (var i = 0, j = 0, len = bin.length / 3, base64 = []; i < len; ++i) {
    var a = bin.charCodeAt(j++), b = bin.charCodeAt(j++), c = bin.charCodeAt(j++);
    if ((a | b | c) > 255)
      throw new Error("String contains an invalid character");
    base64[base64.length] = table[a >> 2] + table[((a << 4) & 63) | (b >> 4)] +
            (isNaN(b) ? "=" : table[((b << 2) & 63) | (c >> 6)]) +
            (isNaN(b + c) ? "=" : table[c & 63]);
  }
  return base64.join("");
}


function hexToBase64(str) {
  return btoa(String.fromCharCode.apply(null,
          str.replace(/\r|\n/g, "").replace(/([\da-fA-F]{2}) ?/g, "0x$1 ").replace(/ +$/, "").split(" "))
          );
}

function base64ToHex(str) {
  for (var i = 0, bin = atob(str.replace(/[ \r\n]+$/, "")), hex = []; i < bin.length; ++i) {
    var tmp = bin.charCodeAt(i).toString(16);
    if (tmp.length === 1)
      tmp = "0" + tmp;
    hex[hex.length] = tmp;
  }
  return hex.join("");
}


